Template Engine Options

You can set options for the various template engines in your config.rb:

set :haml, { :ugly => true, :format => :html5 }

Markdown

You can choose your favorite Markdown library and set options for it in config.rb:

set :markdown_engine, :redcarpet
set :markdown, :fenced_code_blocks => true, :smartypants => true

When using RedCarpet, Middleman will handle links and image tags with its own helpers, meaning things like :relative_links and :asset_hash will do what you expect. However, the default Markdown engine is Kramdown because it's easier to install.

Other Templating Languages

Here is the list of Tilt-enabled templating languages and the RubyGems which must be installed (and required in config.rb) for them to work (this list is from Tilt):